package jn.chen.utils.fileDownLoad.utils.impl;

import jn.chen.utils.fileDownLoad.utils.DownloadService;
import org.apache.commons.io.FileUtils;
import org.springframework.stereotype.Service;

import java.io.*;
import java.net.URL;
import java.nio.file.Files;
import java.nio.file.Path;
import java.nio.file.Paths;
import java.nio.file.StandardCopyOption;

/**
 * @className: DownloadServiceImpl
 * @author: chenLin
 * @version: 1.0.0
 * @description:
 * @date: 2022/11/2 0002 11:05
 */
@Service
public class DownloadServiceImpl implements DownloadService {

    @Override
    public void  download(String url, String saveDir, String fileName) {
        BufferedOutputStream bos = null;
        InputStream is = null;
        try {
            byte[] buff = new byte[8192];
            is = new URL(url).openStream();
            File file = new File(saveDir, fileName);
            file.getParentFile().mkdirs();
            bos = new BufferedOutputStream(new FileOutputStream(file));
            int count = 0;
            while ((count = is.read(buff)) != -1) {
                bos.write(buff, 0, count);
            }
        } catch (IOException e) {
            e.printStackTrace();
        } finally {
            if (is != null) {
                try {
                    is.close();
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }
            if (bos != null) {
                try {
                    bos.close();
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }

        }
    }

    @Override
    public void downloadByApacheCommonIO(String url, String saveDir, String fileName) {
        try {
            FileUtils.copyURLToFile(new URL(url), new File(saveDir, fileName));
        } catch (IOException e) {
            e.printStackTrace();
        }
    }

    @Override
    public void downloadByNIO(String url, String saveDir, String fileName) {
        try (InputStream ins = new URL(url).openStream()) {
            Path target = Paths.get(saveDir, fileName);
            Files.createDirectories(target.getParent());
            Files.copy(ins, target, StandardCopyOption.REPLACE_EXISTING);
        } catch (IOException e) {
            e.printStackTrace();
        }
    }
}
